Intentionally adding nitrogen can make predispose a part to cracking during cold work. If a part needs to be crimped, swaged, staked or otherwise cold worked after machining, You should make certain that the steel is not renitrogenized. (Nitrogen intentionally added during the melt process).

Also, make sure that the cold work in cold drawing was standard draft rather than heavy draft. Heavy draft reduces the ductility remaining in the bar- but makes the chips easier to separate.

Welcome to our blog, Speaking of Precision. As Director of Technology and Industry Research for PMPA, I bring 38 years of hands-on experience in areas of manufacturing, quality and steelmaking. I help answer "HOW?","WITH WHAT?" and "REALLY?"